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runtime: improve CALLFN macro for ppc64x
The previous CALLFN macro was copying a single byte at a time which is extremely inefficient on ppc64x. This changes the macro so it copies 8 bytes at a time. benchmark in reflect: name old time/op new time/op delta Call-8 177ns ± 0% 165ns ± 0% -6.78% (p=1.000 n=1+1) CallArgCopy/size=128-8 194ns ± 0% 140ns ± 0% -27.84% (p=1.000 n=1+1) CallArgCopy/size=256-8 253ns ± 0% 159ns ± 0% -37.15% (p=1.000 n=1+1) CallArgCopy/size=1024-8 612ns ± 0% 222ns ± 0% -63.73% (p=1.000 n=1+1) CallArgCopy/size=4096-8 2.14µs ± 0% 0.53µs ± 0% -75.01% (p=1.000 n=1+1) CallArgCopy/size=65536-8 33.0µs ± 0% 7.3µs ± 0% -77.72% (p=1.000 n=1+1) Change-Id: I71f6ee788264e61bb072264d21b77b83592c9dca Reviewed-on: https://go-review.googlesource.com/134635 Run-TryBot: Lynn Boger <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Carlos Eduardo Seo <[email protected]> Reviewed-by: Michael Munday <[email protected]>
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